Car-brake-operating mechanism



Nov. 4 1924. 1,513,888

W. D. BREWSTER CAR BRAKE OPERATING MECHANISM Filed Nov. l0. 1923 o I' oa 1]/ ,A INM rok t A Y," B y .f/(f L *A Patented Nov. 4, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM D. BREWSTER, OF SYRACUSE, NEW YORK, ASSIGNOR TO NATIONAL BRAKECOMPANY, INC., OF BUFFALO, NEW YORK,v A CORPORATION 0F NEW YORK.

CAR-BRAKE-OPERATING- MECHANISM.

Application filed November 10, 1923. Serial No. 673,999.

To all whom t may concern:

Be it known that I, WILLIAM D. BREW- s'rnn, a citizen of the UnitedStates of America, of Syracuse, in the county of Onondaga,"in the Stateof New York, have invented new and useful Improvements inCar-Brake-Operating Mechanism, of which the following, taken inconnection with the accom anying drawings, is a full, clear and exactescription. l

This invention relates to a car brakeoperating mechanism and refers moreparticularly to the disposition of the various parts in compact relationand in such manner that practically the entire load and strains ofapplyin the brake will be concentric in and aroun the operating shaft.

The main object therefore, is to provide a device of this characterwhich may be.

installed in a relatively small space upon l the car and at the sametime to utilize the operating shaft as a part of the supporting meansfor the conical drum to which the brake operating chain is attached.

Other objects and uses relating to speicific parts of the device will bebrought out in the following description.

In the drawings Figure 1 is an end view partly broken away, of a brakeoperating mechanism embodying thevvarious features of my invention. f

Fi re 2 is a longitudinal vertical sectiona view taken on line 2 2,Figure 1.

This device is adapted to be placed in an upright-position upon the endofta car with its operating shaft in a substantially horizontal positionand comprises a main supporting frame which, in this instance consistsof parallel upright bars 1v and .-1- connected `and held vin spacedrelation by lower and upper end posts 2 -andK-fQ-, the outer upright bar-1- being provided with an outwardly arched brace bar -3', all of saidbars being pref-- erabl made as an integral unit of cast metal or ot ersuitable material' v The central portions of the bars .-,-1--, -1-, andw3- are provided with horizontally alined coaxial kbearings \-4-, 5 and4S-e, the end bars and .-6 being adapted to receive and support a brake'operating shaft -7-, while the intermediate bearing -5- serves toreceive and partially support a conical brake drum -8- which is alsoloosely mounted upon the shaft -7- coaxial therewith to permit relative,rotary movement of the shaft and drum. 'f The main body of the drum -8-which is interposed between the bearings .5 and -6 is relatively largerthan the portion which extends through the bearing -5 and is madefrusto-conical and arranged with its larger end adjacent the bearing-5-, said drum being provided with a spiral peripheral groove -9-.`

The larger end of the drum -8- is provided with a radially extending arml0- having a slot -11- extending inwardly from the outer end thereof forreceiving one end of a brake operating chain or cable -12 which isdetachably connected to said arm 10 by adapted toA be wound in thespiral groove of the drum as the latter is rotated in the directionrequired for applying the brake whereby the initial rotary movement ofsaid drum will cause a rapid take up of the slack of the chain -12-following which the chain will be gradually wound upon the reducedportions of the cone of said application of the brake. U

The enlarged 'portion of the drum is proa bolt -13- and is' vdrum inorder to increase the power of vided with an internal oil chamber or rev-15- for receiving and supporting a hand wheel -16 which is secured tothe tapered portion 15iby means of a nut 17 lon the adjacent outerthreaded end of the shaft, said hand wheel --16- being concentric withthe shaft. and of relatively large diameter to serve as the means forrotating the shaft at will and is preferably concaveconveX in crosssection with its concave side facing the frame and its peripheral rim184- disposed within the plane of its hub so as to surround the adjacentend of the brace bar -3- and thereby bring the wheel into more compactrelation to the frame for economy of space and convenience ofmanipulation.

duced and extended beyond the bearing lt for receiving a nut -19- whichco- 'operates with the adjacent bearing 4- to hold the shaft againstendwise displacement in one direction while the hub of the hand wheeli6- cooperates with the bearing 6 to hold the shaft against endwisemovement in the other direction.

, A portion of the shaft 7 between the bars -land -1- andpreferablyadjacent the inner face of the bar 1- is angular or squareJ incross section. and upon this square portion is keyed a tight spur pinion-20-. c

A stationary shaft or stud -21- is secured in suitable bearings on thebars -1-v and 1- to extend across the intervening space between saidbars at one side and parallel with the shaft -7- for receiving andsupporting a spur gear 22- and a pinion 2S- which is preferably formedintegral therewith or secured thereto so that both may rotate in unisonupon the stud -21-;

The gear 22uis relatively larger than the meshes with the pinion 20- onthe angular portion of the shaft -7-, while the pinion 23eme`shes with arelatively larger spur gear -24- which is secured to a reduced portionof the hub of the drum -8- between the bearing -5- and pinion -20-thereby establishing a driving connection between the shaft -7 and drum-8- 4as the shaft -7- is rotated by the hand wheel 16- in applying thebrakes or reversing the operation when the brakes are released.

The ratio of the gears lfor transmitting rotary motion from the shaft-7- to the drum -8 is suchv as to greatly increase the power applied tothe brake as compared with that applied to the hand wheel while thewinding of the cable or chain 12 around the portion of the drum -8- alsoserves to increase the power of application of the brakes. vFurthermore, by mounting the drum -8- directly upon the intermediateportion of the shaft -7- and also mounting the gears -20- `and 24 uponthe shaft 7 and hub of the drum -8- respectively, brings all of thoseparts into coaxial compact relation, and thereby concentrates the majorstrains orloads in and around the same axis and'enables each part tostiifen the others against radial vibrations which greatly increases thesturdiness and eiiiciency of the brake mechanism as a whole in additionto the advantage that the entire device may be used upon the ends ofcars where other devices would be impracticable.

Suitable means is provided for holding the brake o erating mechanism inposition for setting t e brakes,'said means consisting in this instance,of arock shaft -25- journaled in suitable bearings in the upper ends ofthe opposite bars -1 and -1- of the main supporting frame for receivingand' supporting a pawl or detent 2G- which is movable into and out ofengagement with the teeth of the gear 2li- The pawl -26- is providedwith a hub -27- Afor receiving the shaft 295-3 one end of said hub beingprovided with a socket -28- of angular or square cross section forreceiving a similarly formed end -29- of a sleeve -30- which isjournaled in the adjacent bearing of the bar -1- coaxial with the rockshaft -25- so as to allow said rock shaft to turn freely therein.

The outer end of the sleeve -30- is enlarged to abut against theadjacent face of the bar -1 and is provided with stop shoulders -31- atopposite sides of its axis;

A weighted arm 32- is pivoted upon a reduced portion of the outer end ofthe rock shaft -25- to swing to opposite sides of the vertical plane ofits axis as shown by full lines and also by dotted lines in Figure 1,and is held inoperative osition by a nut -33- on the` adjacent en of therock shaft.

lThe stop shoulders 3l. are located` in the path of movement of the rockarm 32 so that when the weighted arm is rocked to one side of the axislof the shaft 25- yit will engage the adjacent stop shoulder 31 andthereby rock the sleeve -30- to force the free end of the pawl intoengagement with the teeth of the gear Q4- On the otherhand, by reversingthe movement of the weighted arm B2-it will engage the other stopshoulder 3land thereby rock the sleeve 30 in a corresponding directiontorelease the pawl froml engagement with said gear, the weighted end ofthe arm bein rovlded with indicia such as On and ifi to indicate theposition of the pawl.

I claim:

1. In a brake-operating device, a frame having opposite end journalbearings and an intermediate journal bearing .coaxial with the endbearings, a rotary shaft extended through the intermediate bearing andjournaled in the end bearings, means for rotating the shaft, a rotarydrum journaled in the intermediate bearing coaxial with the shaft, meansfor transmitting rotary motion from the shaft to the drum, and abrakeoperating cable attached to the drum.

2. In a brake-operating device,'a frame having opposite end journalbearings and an intermedlate journal bearing coaxial with the endbearings, a rotary shaft extended through the intermediate bearing andjournaled in the end bearings, means for rotating the shaft, a rotarydrum journaled in the intermediate bearlng coaxial with the shaft,gearing in the spacefbetween one of major portion thereof disposedbetween the misses B the end bearings `and the intermediate bearinWitness whereof I have hereunto set ing for transmitting rotary motionfrom the my hand this 3rd day of November, 1923.

shaft lto the drum, Said drum having the WILLIAM D. BREWSTER.

Witnesses: f

H. E. CHASE, RITA CAMroLm'ro.

intermediate bearing and the other end bearing, and a brake-operatingcable connected to said drum.

